Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Reader\Xls" not found in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Reader/Xls/DataValidationHelper.php:10 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Reader/Xls/DataValidationHelper.php on line 10